Java Regular Expressions (Regex) provide a powerful way to match patterns in strings using the Pattern and Matcher classes from the java.util.regex package. Regex is widely used for text search, data validation, and input filtering.
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Which package contains the classes for regular expression handling in Java?
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Question 2 of 15
2. Question
What does the method matcher.find() do?
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Question 3 of 15
3. Question
What is the purpose of the Pattern.compile() method?
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Question 4 of 15
4. Question
Which of the following matches a single digit?
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Question 5 of 15
5. Question
What does the regex ^Java match?
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Question 6 of 15
6. Question
What will the pattern a*b match?
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Question 7 of 15
7. Question
Which regex symbol represents “any one character”?
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Question 8 of 15
8. Question
What does the method matches() do in Java Regex?
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Question 9 of 15
9. Question
Which of these will match a whitespace character?
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Question 10 of 15
10. Question
What does the regex [a-zA-Z] match?
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Question 11 of 15
11. Question
What is the output of “abc123”.replaceAll(“\\d”, “X”)?
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Question 12 of 15
12. Question
What does the pattern [0-9]{3} match?
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Question 13 of 15
13. Question
Which of the following is true about Matcher.matches() and Matcher.find()?
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Question 14 of 15
14. Question
What does \\ represent in Java regex strings?
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Question 15 of 15
15. Question
Which of the following matches “abc123” fully?
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Summary
Java Regular Expressions simplify pattern matching, input validation, and string manipulation using Pattern and Matcher classes. Mastering regex is essential for building robust Java applications that handle complex text data.
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